E5 V85 with defective fuel tank

[Frostbitten]

Leaking at the base of the fuel pump port where it turns vertical and starts the treads. I think it's leaked since new or nearly new, cause I always smell fuel. I always figured it the was the tip valve issue. Not so, did the tip valve and on closer inspection with the shrouds off the tank I see fuel seeping out at the very edge of where the port attaches to the tank. The dealer I bought the bike from is 950 miles away and williing to try a mercy case with Piaggio but not gauranteeing anything. New tank without anything on it is $1200. Local dealer is also willing to try a goodwill with Piaggio but not hopeful. There is no possible way it is an owner error issue. this is a defective tank. I believe it is a HDPE plastic and if I had a fairly assured sealing method, I would forgo dealing with the dealers and Piaggio and patch it. It's seems to be a small area. I have read much on plastic welds, epoxy and other compounds and not sure I have a good feeling about how to repair it. Really hoping someone has some good ideas.

 

[MG02]

I am sorry to hear that. I have not heard about that issue before and have driven my V85TT for around 12,000 kilometers including a fair bit on gravel roads. I had removed my tank before when I was adding the fog lights so agree that it is a plastic tank. Not sure how to repair that but hope that Piaggio is willing to listen about that. Not sure how long time/kilometers (miles) you have owned it.
Keep us on the progress as this will be interested to know how it gets resolved.

 

[john zibell]

So the tank is leaking from two areas? You really have a bad tank. Hopefully Piaggio will make it good. If not, you need to replace that tank no matter the cost. Repairing a plastic panel is not too bad. I don't think I would trust a repair to a plastic tank.

 

[Frostbitten]

The bike has 6,000 miles and prolly a few hundred on fire service roads. It is only leaking in one spot, at the base of the neck for the fuel pump. It think it's been leaking since new or nearly new but it seems to be getting worse. I imagine the crack is slowly expanding with vibration. I would trust a repaired tank, for sure.

 

[scottmastrocinque]

If your goodwill claim is denied, use coarse sandpaper to rough up the area to improve adhesion and use this product.

It will seal the crack.

I’ve seen this type of fracture on other motorcycles which was usually caused by leverage applied to the fuel bung with a gas nozzle. If you allow the metal spigot to act as a fulcrum it can put tremendous stress on the tank.

 

[GTM®]

It is only leaking in one spot, at the base of the neck for the fuel pump.

You started a new thread on the same problem?

Cracked and leaking at the fuel pump tank neck help on 21 V85

After following the discussion on Tip valve and evac and doing the mod, I still smelled gas and on closer look have found a little bit of fuel running down the tank. So removed the tank shrouds and can see fuel coming out at the base of the neck for the fuel pump when I turn the key on and the...

www.guzzitech.com

 

[Frostbitten]

You started a new thread on the same problem?

Cracked and leaking at the fuel pump tank neck help on 21 V85

After following the discussion on Tip valve and evac and doing the mod, I still smelled gas and on closer look have found a little bit of fuel running down the tank. So removed the tank shrouds and can see fuel coming out at the base of the neck for the fuel pump when I turn the key on and the...

www.guzzitech.com

I thought I was just replying to the last post?

 

[scottmastrocinque]

An honest mistake. To reply to a post in a thread, at the bottom of the post you want to reply to,

Click:




To create a new thread, a new topic entirely, go to the appropriate forum and at the top of the page, you create a new thread by inputting the thread title, then Click:

 

[Frostbitten]

So the tank is leaking from two areas? You really have a bad tank. Hopefully Piaggio will make it good. If not, you need to replace that tank no matter the cost. Repairing a plastic panel is not too bad. I don't think I would trust a repair to a plastic tank.

No, just where the fuel pump goes into the tank.

 

[Frostbitten]

If your goodwill claim is denied, use coarse sandpaper to rough up the area to improve adhesion and use this product.

It will seal the crack.

I’ve seen this type of fracture on other motorcycles which was usually caused by leverage applied to the fuel bung with a gas nozzle. If you allow the metal spigot to act as a fulcrum it can put tremendous stress on the tank.

View attachment 35805

I can see how that would happen with a fill opening, but the fuel pump opening is a few inches away. It looks like the neck is welded or sealed to the tank where it attaches and seeping out there. I don't think there is anything that could possibly put pressure on that spot to break the weld or seal. I will try to attach a short video if I can figure out how to transfer to my laptop.

 

[Frostbitten]

Here’s a short video of the pump port and where it leaks when the pump is pressurized.

 

[scottmastrocinque]

There is a rubber ring under that black collar. I have seen them pinched from being over tightened.

It may be worth checking if that is the source of your leak unless you can actually see a crack in the tank. I cannot.

 

[Frostbitten]

Ya, I was hopeful it was the gasket, but it’s a visible leak. I made sure it wasn’t coming from down the threads. The video shows it seeping out but for some reason the video won’t play. I really appreciate your suggestions